JPS6281291A - Method for electric arc cutting of core-containing tubular electrode and metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cored tubular electrode and a method for cutting or punching metal using an electric arc.

[Conventional technology]

Traditionally, the heat of an electric arc (hereinafter referred to as the arc) was used to produce objects such as steel plates at relatively high speeds.

Cutting, gouging and chamfering are known.

One method is to cut the metal using a stream of air to remove the molten metal. It is an arc.

In an air carbon arc, an arc is created between a carbon graphite electrode and the metal part to be melted. Compressed air jets or jets are continuously directed at the melting point of the metal to remove the molten metal. Metal removal using air curlen continues as long as the carbon arc is cutting. This method is used for cutting and gouging, but gouging can also be used for welding grooves and the base of welds.

It is also used to process defects in the weld area.

The working end or tip of the electrode is heated to a high temperature by the arc current, but does not melt. The electrode is lost due to oxidation of carbon or sublimation of the tip and is therefore consumed during cutting. Air cargen arc cutting requires an electrode holder, a cutting electrode, a power source, and an air source. The work may be done by hand or by machine.

The metal part or material is continuously heated and melted while the molten metal is forced away by a free, high velocity air stream flowing along the exposed working side of the electrode. In normal use, an air stream blows under the electrode tip, and the length of the arc must have clearance to continuously supply air to the cut. The air flow is preferably parallel to the electrodes. In this way, since the airflow flows between the electrode and the metal material, the force of the high-speed airflow is large enough to efficiently remove the molten metal under the arc and maintain a constant extrusion effect even when the electrode is worn out. is supplied.

The arc receives an impact according to the arc voltage by lightly touching the electrode with the component or pulling it back to a suitable position. Egusi technology differs from welding technology, which removes waste without allowing it to accumulate. The correct arc length is maintained by moving the electrode rapidly to match the rate of molten metal removal.

[Problem that the invention seeks to solve]

The following deficiencies are observed in the conventional air force °- & arc gouge and cut method. (1) Car? The arc is unstable and produces unbearable noise.

Under the condition (2), carbon is deposited in the grooves, causing undesirable deformation of the material in the grooves. (3) Carr;
Bottle electrodes are fragile and easily break during operation.

, (4) It is easy to emit odor and cause discomfort to the worker and his/her surroundings. Copper deposits occur in carbon electrodes coated with copper, which interferes with subsequent operations.

Therefore, it is a self-melting type that is configured to generate a stable arc and make clean cuts, and includes a steam generator, a reducer, a gas generator, etc.

It would be desirable to have a metal arc cutting electrode that can increase the heat provided by the arc during cutting or gouging operations and does not have the disadvantages of carbon electrodes.

It is an object of the present invention to provide an air-metal electrode arc for cutting or gouging metal.

Another object of the present invention is to cut or punch using an air/metal electrode arc that is self-melting during the cutting operation and is characterized by a stable arc that generates heat during the cutting or punching operation. The purpose is to provide a method.

These and other objects will become apparent from the following description and claims, as well as the accompanying drawings.

[Means for solving problems]

The present invention is a cored tubular metal arc electrode for cutting and ejecting metal materials using gas (e.g., air) as an auxiliary means, and a particulate reactant mixed with a metal oxide that reacts heat-radiatively with the metal tube. Consists of metal. optionally arc stabilizer,
Selected among melting agents, reducing agents and gas generating agents. and a core material containing 30% by weight of additive materials, determined based on the total weight of the core material. The particulate reactant metal has an oxide free energy of formation of at least about 100,000 calories per gram atom of oxygen at 25°C (298,16°K), and the exothermically reactive metal oxide to be mixed has an oxide free energy of at least about 100,000 calories per gram atom of oxygen. It is characterized in that its free energy of formation at °C is in a range not exceeding about 90,000 calories per gram atom of oxygen.

The core material may be about 30% by weight of the total electrode weight, and the core material itself may contain about 10-70% by weight reactant metal, about 90-30% by weight metal oxide, and 0 to about 20% e.g. ~1
0 wt i-% arc stabilizer.

Consists of additives selected from melting agents, reducing agents and gas generating agents.

Another aspect of the invention is a method of cutting and gouging metal materials with an electric arc. How?

It consists of at least one metal tube and a particulate reactant metal mixed with a metal oxide that reacts with heat radiation.

and a core material containing about 30% by weight of a particulate reactant selected from an arc stabilizer, a melting agent, a reducing agent, and a gas generating agent based on the total weight of the core material. It's about doing.

As discussed above, the particulate reactant metal is characterized by an oxide formation free energy of at least about 100,000 calories per gram atom of oxygen at 25°C; It is characterized by a free energy of formation at 25° C. of not more than about 90,000 calories per gram atom of oxygen.

The method according to the invention comprises: cutting or gouging the metal material between the electrode end and the metal material; supplying a stream of gas, e.g. air, under pressure to the cut or gouging location; and performing the cut or gouge. It consists of making continuous cuts or gouges while sending a constant stream of gas to the desired location.

The cored tubular metal electrode is characterized by significantly improved gas-assisted gouging and cutting performance compared to conventional gas-assisted carbon electrodes. Unlike carbon electrodes, metal electrodes are easy to handle.

Does not overheat as often happens with carbon electrodes.

The wire electrode is capable of producing a precisely controlled electrical arc using a DC power source, preferably at a constant voltage positive pole. The heat generated by the arc causes local melting of the base metal and wire, forming a pool of molten metal, which is quickly removed by the air blowing used in conjunction with the process. The air is applied precisely to the cut or gouged area.

The novel wire electrode of the present invention allows nine operators to repeatedly obtain a well-finished gouge in the intended location. The wire electrodes can be moved and actuated very quickly with extremely precise precision.

〔Example〕 The invention is particularly useful in continuous electrode constructions.

For example, soft iron is used in the metal tube, allowing continuous metal cutting or gouging with minimal downtime compared to fragile carbon electrodes. Furthermore, continuous electrodes continue to be used by employing arc stabilizers, melting agents, gas generating agents, etc. from time to time.

In addition, a stable electric arc can be maintained during the substantial operating time up to the end of cutting and gouging.

One embodiment of the invention is shown in FIG. 1, which shows a coil winding 10 of a tubular metal arc electrode 12 for use in a semi- or fully automated process. For example, such an electrode has an outer diameter of 0.025 to 3/8
inches or preferably in the range of 1716 inches to 1/8 inch. The wall thickness will vary depending on the outside diameter. One example of a cored tube has an outside diameter of about 0.05 inch and a wall thickness of about o.
, o o s inches to 0.015 inches, or 0.0
It ranges from 1 inch to 0.02 inch. 'Electrode tube 1
3 is made from mild steel, such as 1030 steel, although it can also be obtained from other fabricated materials. But steel with less carbon is better.

The electrode 12 is made of 1030 steel through continuous forming rollers.
Pour into the gutter, thickness 0.012 inch width 047
Manufactured in 5 inch pieces.

After the core material 14 is fed into the trough, a forming process gradually closes the pieces into a cylinder. The tube 12 is then drawn to a size that accommodates the core, during which process the core material is consolidated or compressed to reduce its size. FIG. 2 is a cross-sectional view of the completed tube.

FIG. 2 shows a cored tubular electrode of defined length, which is similar to the continuous tubular electrode of FIG. It consists of a tube 12A similar to the electrode 12. FIG. 3 is a sectional view taken along line 3--3 in FIG. 2.

As mentioned above, the core material is mixed with exothermic reactive metal oxidation anastomoses. Optionally, from O to 3 per weight of core material
It consists of a particulate reactant metal containing 0% by weight of additives selected from arc stabilizers, melting agents, reducing agents and gas generants. Preferably, the reactant metal in the core mixture is about 10% to 70% by weight (e.g., about 20% to 50% or about 25% to 35%) and the amount of metal oxide is about 30% by weight. % to 90 inches (eg, about 50% to 80%, or about 65 inches to 75%), and optionally 0 to about 20 inches.

As noted above, the nine reactant metals have free energies of oxide formation of at least about 100,000 per gram atom of oxygen.
It has the characteristic of being 25°C with 0 calories. The reactant metal includes some selected from magnesium, aluminum, zirconium, titanium and alloys of at least two thereof. The metal oxide is preferably an iron-based oxide such as iron oxide or nickel oxide. Preferred reactant metals are magnesium, aluminum alloys, forming about 20 to 50% by weight of the core material. The metal oxide is preferably iron oxide such as Fe2O3 or Fe3O4. As a sample, the 9 reactants magnesium and aluminum alloys contain approximately 50% by weight magnesium and 5
Consisting of 0% aluminum by weight.

The iron oxide mixture consists of about 30% by weight magnesium, aluminum alloy and about 70% by weight core iron oxide.

In this example, the additives are removed and iron oxide is added in excess to provide a good melting agent for the oxidizing reactant metal.

Additives To ensure that the electrode functions optimally, at least one additive may optionally be included in the core material.The additives may be selected from arc stabilizers, melting agents, reducing agents, and gas generants. The O arc stabilizer selected is selected from the group consisting of alkali metals and alkaline earth metal compounds including silicates, oxides, carbonates, and the like.

Melting agents include iron oxide, iron carbonate + TiO2+ CaCO
3mZr0 and further contains alkali metal and alkaline earth metal valve compounds and silicates.

Typical reducing agents are St, Mg, Al, Mn, Ti
and its iron alloys 9, such as iron°-silicon, iron-magnesium.

Iron aluminum and iron titanium.

Gas generating agents include iron carbonates, organic materials (e.g. cellulose), mineral hydroxides (bentonite, full
er) soil, mica, etc.) 1st grade. These generate gases such as CO2 and steam within the arc.

A steam generating agent that works to blow away the molten metal in the hollowed out area is also used as an additive, such as ZnO.

There is such a thing as low melting fluoride.

As mentioned above, if there is extra iron oxide in the core.

It helps in oxidizing the aluminum and magnesium in the core to the corresponding oxides (eg ht203.Mg0) and forming slag.

The tubular part of the electrode may be made of mild steel, and the types of steel include 1008, 1010, 1020, and 1030°10.
There are carden steels such as 40.1060 and 1080. Steels with low carden content are desirable.

The tubular portion of the electrode can also be made from other fabricated metals. It can be shaped into a tubular electrode with sufficient mechanical strength and can be handled with a normal wire feeding device.

The core material weighs approximately 5 to 30% (preferably 8%) based on the total weight of the electrode.
-20) weights in the range t and 9 reactant metals are the same <20
-50% by weight metal oxides, about 20-70% by weight, and the remainder of the core material optionally from about 20 or 30% by weight of additives 1, such as from about 1% to about 10%.

As described here, the tubular portion of the electrode has a wall thickness of approximately 0.0
0.05 to 0.05 inch and outer diameter approximately 0.025 to 37
It is 8 inches. A preferred electrode has an outer diameter of 1/16
to 1/8 inch, wall thickness approximately o, oos to 0.015
inches or about 0.01 to 0.02 inches.

Test Results Results using the 1/16 inch outside diameter cored wire electrode of the present invention show that as a function of current input, a significant improvement in metal removal rate is obtained.

Generally speaking, there is a limit to the amount of current that can be applied to an electrode, especially since carbon electrodes tend to overheat. When the tubular electrode of the present invention is used in gas-enhanced gouging, the current is substantially increased, but metal removal is significantly improved.

Tests were conducted with 1/16 inch diameter cored electrodes having the following core materials:

(1) Approximately 50,150 Mg of approximately 29% by weight powder blend type
/ k1 alloy.

(2) Approximately 71% by weight Fe3O4 (mill scale) Fe
304 contained about 4% by weight of 5IO2 based on iron oxide. The core mixture is approximately 20% of the total weight of the electrode.
The steel exterior accounts for 80% by weight. The exterior is 10
It was 08 steel. In one test group, the following results were obtained.

Table 1 1716 inch outer diameter core 1 150 30 85-90 4.
82 250 35 85-90 7
．． 33 350 40 85-90 1
3.34 380 42 85-90
17.4 As seen above, the substantial increase in metal removal.

Using the core wire electrode of the present invention, increased current was obtained without overheating.

Furthermore, the test was performed using a core wire of 0.062 inch diameter (1/16
The test was also carried out using the same core material (inch), but the amount of core material in the electrode was approximately 2% by weight, and the wire exterior was made of mild steel (1008 steel) and the remainder was approximately 88.
The difference is that it was Chi. During the test, the following items were evaluated. (,) Air pressure.

(b) Arc voltage, (C) wire supply speed, (d)
Amount of metal removed per hour. The test was carried out at an air pressure of 40 p.
s, i (pounds per square inch) to 100p, s
, i at four separate air pressures. The results are shown in Tables 2.2A, 2B and 2C.

Below is a daily table 2-100 p, s, i-air pressure test of the core wire 0.062 inch diameter of the present invention Nα
w, f, s, * IV Removal amount Air king ** (i-p-m) (7-gu momme (
, r))-yf! :≦)”/EI danyumuyu□1 500 360 45
21.4 1002 450 33
0 45 23.0 1003 4
00 300 45 19.8
1004 350 280 45
17.4 1005 300 25
0 45 17°4 1007 45
0 335 40 21.4 10
08 400 355 40 19
．． 8 1009 350 340
40 18.2 10010 300
300 40 15.8 1
0011 400 300 35
15.8 10012 350
275 35 12.7 10013
300 265 35 16.
6 10014 300 260
30 12.7 10015 250
230 30 11.9 1
0016 200 200 30
10.3 100 * w, f, s = wire speed per inch per minute ** 1 pound per square inch pressure Table 2 A -80p, s, i, -x pressure Core wire of the present invention 0 .062 inch diameter * Test required w, f, s, I
V exclusive (i, p, m) (An 4A)
(Voltage) Pound/hour 1 500 35・
O4520,624503204520,6 34003004518,2 43502754515,0 53002504511,9 65003504015,0 74503204019,8 84003004021,4 93502754017,4 10 3002504013,5 114003003518,2 123502753518,2 133002503512,7 142502253511,1 15200200358,7 163002503011,1 172502253010,3 182002003010,3 Table 2 B -60p,s,i,-Air Pressure Test N(L w,f,s
*IV removal
Amount 1 500 350 45
21.42 450 320
45 20.63 400 30
0' 45 17.44 350
275 45 15.05
300 250 45 1
3.56 500 350 40
19.87 450 320
40 21.48 400
300 40 19.89 350
275 40 16.610
300 250 40
11.911 400 300
35 16.612 350 27
5 35 19.813 300
250 35 16.614
250 225 35 1
1.115 200 200 3
5 10.3 and below test day w, f, s*I V
Removal amount 2 450 320
45 20.63 400
300 45 13.54
350 275 45
11.95 300 250
45 11.96 400
300 35 17.
47 350 275
35 11.98 300
250 35 13.59
250 225 35
8.710 200 200
35 7.1 or less The above test Vi, voltage about 35 to 45 volts, current about 20
0 to 350 ans 4 a and 200 to 45 per minute
The amount of metal removed (i.e., the metal gouged out of the steel plate) at a wire speed of 0 inches and a current range of 300 to
350 Ans 4 A and wire feed speed 4 per minute
The results are shown when the value is set from 00 to 450. This result shows that as the arc voltage increases, the amount of metal removed also increases. At low air pressures, it is generally necessary to move the wire slowly for effective metal removal.

With air pressure assistance of 40 to 100 p, s, i, the metal removal rate was found to be around 20 to 21.5 lb/hr at a wire speed of about 450 inches per minute and a voltage of about 40 yN. There is. Increase the voltage to 30""45. Approximately 13 to 23 punts of metal were removed per hour in the N rut range. It is necessary to concentrate the air accurately during the gouging process.

In other test groups, 9 heavy single-nosed mild steel IJ z y
9 welds on 3/4 inch thick hot rolled steel plate.
It was removed in a horizontal position using a 1/4 inch air assisted carbon puke according to the invention and a 1/16 inch diameter core steel electrode. The results are shown in Table 3.

Although the core steel wire invented in Japan has only 1/4 the diameter of the cardan wire, it has shown remarkable improvement. Generally, as the arc voltage increases, the noise also increases. The noise peak is for carbon arc.

This occurs when the arc is long. However, in the present invention, the arc length (arc voltage) is relatively constant regardless of the skill of the operator, and therefore there is little noise.

As shown in Table 3, the amount of metal removed using the core steel wire is greater than that removed with the 1/4 inch carbon electrode. The average power consumption in kilowatts is lower for the cored steel of the present invention.

Core person of the invention Steel Wire (25% (7) 5015
0 magnesium/aluminum alloy and 71 Fe5
Very good results were obtained when various alloys were hollowed out using OA). Hollowed metal has brazing metal deposits, stainless steel type 304. Hadfield Steel (13% Mn
), copper and aluminum.

A 1/8 inch diameter bare carbon electrode was compared to a 5/32 inch diameter copper coated carbon electrode under 60 p, s, i.

Arc time for bare electrodes is approximately 20-35 seconds, 62-63 seconds
The metal removal from the steel plate was 125 to 2.85 pounds per hour at approximately 40 to 55 amps. The 1/8 inch carden electrode was heated to a clear color (incandescent), and oxidation began immediately at a current of more than 60 amperes. In this way, the current was kept below the figure.

5/32 inch copper-coated carbon could tolerate even higher currents due to the copper's improved conductivity.

Thus, this electrode has 45 to 58 delts and a high 8
It can operate under 0 to 190 amperes. At 80-150 amps, the metal removal rate from the steel plate is 2.43-9 lb/hr, and at 160-190 amps (58 galt)
The amount of metal removed was 11-13.8 pounds/hour. As before, the carbon electrode was air assisted at 60 p-s, i.

The core steel wire electrode of the present invention has a low gouge rate.

It is superior to copper-coated carbon electrodes in that it has a higher cut rate and allows a wider range of operating parameters.

The comparison is between a 1/4 inch diameter carden electrode and a 1/16 inch diameter core wire of the present invention (29%50150Mg/
p, between the alloy and 71s Fe504).

The electrode of the present invention showed substantially better results in removing metal from steel plates, as shown below.

Table 4 Air auxiliary power Metal cutting rate Kaden 150 ampere 7 8-9 lb/hour 54 ruto book Invention 150 ampere 10,3 lb γ hour 54 port book Invention 200 ampere 15 lb 7:54 delt table As is clear from 9, the present invention showed a higher metal cutting rate than the carbon electrode.

Examples of other electrode materials of the present invention are as follows.

As mentioned above, the sheath forming the tubular electrode is preferably constructed from carden steel or other ferrous metal, although of course other fabricated metals may be used which have sufficient mechanical strength and are compatible with conventional wire feeding equipment. It can be made into a tubular electrode.

The core electrode of the present invention can be used for cutting or gouging many kinds of metals9, such as ferrous metals (steel, etc.).

cast steel, iron alloy, etc.), aluminum, aluminum alloy,
Copper and copper alloys, titanium, titanium alloys, nickel-based alloys, cobalt-based alloys, etc.

When cutting or gouging metal, air under pressure is directed into the cutting area to blow away molten metal. This air is distributed along the length of the electrode or along the sheath surrounding the electrode.
from 150 psig or by multiple streams or a single stream concentrated near the electrode. The air flow does not necessarily have to be concentrated at the same point as long as it is a specific flow/mother turn.

〔effect〕

Since the present invention is configured as described above, it is possible to minimize post-gouging processing such as welding, painting, and metal coating.

Also, wire electrodes can conduct a much higher current than carbon electrodes. With one wire.

The current flowing through the carbon electrode can be covered by at least three times or more.

Furthermore, the wire electrode of the present invention can be used for precise gouge and cutting processes such as removing rivets, cutting spot welded two handles, cutting plates close to thin plates, removing attachments, removing plating and hard surfaces, removing cranks and defective parts, etc. It is effective for

[Brief explanation of drawings]

FIG. 1 is a three-dimensional diagram showing one embodiment of a coil-type electrode. FIG. 2 is a diagram showing an example of a rod-shaped electrode. FIG. 3 is a sectional view taken along line 3--3 in FIG. 2. In the figure 10... Coil, 12... Electrode, 13...
tube. 14... Core material. FIG.2

Claims (1)

[Scope of Claims] 1. Consisting of a processed metal tube and a particulate reactant metal mixed with a metal oxide that reacts with heat dissipation, and containing an arc stabilizer, a melting agent, a reducing agent, and a gas generating agent based on its total weight. a cored tubular electrode for gas-assisted metal cutting and gouging, the particulate reactant metal being oxidized at 25°C; The free energy of formation is at least 100,0 per gram atom of oxygen
00 calories, and the exothermically reacting metal oxide to be mixed has a free energy of formation of no more than 90,000 calories per gram atom of oxygen at 25°C. 2. The cored tubular electrode according to claim 1, wherein the core material accounts for about 5 to 30% by weight of the total weight of the electrode. 3. The core material substantially comprises about 10-70% by weight of reactive metals, about 30-90% by weight of metal oxides, and 0-20% by weight of arc stabilizers, melting agents, reducing agents and gas generating agents. A cored tubular electrode according to claim 2, comprising an additive selected from the group consisting of: 4. The reactant metal is magnesium, aluminum,
4. A cored tubular electrode according to claim 3, which is selected from zirconium, titanium, and alloys of at least two of these metals. 5. The cored tubular electrode according to claim 4, wherein the reactant metal is an Mg-Al alloy, and the metal oxide is an iron-based metal oxide. 6. The cored tubular electrode according to claim 5, wherein the Mg-Al alloy is about 20 to 50% by weight of the core material, and the iron-based oxide is 50 to 80% by weight of iron oxide. . 7. The Mg-Al alloy contains about 50% Mg and 50% A.
1. The cored tubular electrode according to claim 6, wherein the amount of alloy in the core material is about 30% by weight, and the amount of iron oxide is about 70% by weight of the core material. 8. The cored tubular electrode of claim 5, wherein said tubular electrode has an outer diameter of about 0.025 to 3/8 inch and a wall thickness of about 0.005 to 0.05 inch. 9. The cored tubular electrode of claim 8, wherein said tubular electrode has an outer diameter of about 1/16 to 1/8 inch and a wall thickness of 0.008 to 0.015 inch. 10. A processed metal tube, consisting of a particulate reactant metal mixed with a metal oxide that undergoes a substantial exothermic reaction, with additions selected from arc stabilizers, melting agents, reducing agents and gas generating agents based on the total weight thereof. a cored tubular electrode for gas-assisted metal cutting and gouging comprising a compressed core material containing from 0 to about 30 wt. A cored tubular electrode is selected from the group consisting of alloys consisting of at least two metals, and the heat dissipating reacting metal oxide to be mixed is selected from iron-based metal oxides. 11. The cored tubular electrode according to claim 10, wherein the core material accounts for 5 to 30% by weight based on the total weight of the electrode. 12. The core material contains substantially about 10 to 70% by weight of the reactant metal, about 30 to 90% by weight of iron-based metal oxide, and about 1/20 to 20% of an arc stabilizer, a melting agent, and a reducing agent. 12. The cored tubular electrode of claim 11, comprising a material selected from the group consisting of a gas generating agent and a gas generating agent. 13. The cored tubular electrode according to claim 12, wherein the reactant metal is a Mg-Al alloy, and the metal oxide is iron oxide. 14. The cored tubular electrode according to claim 13, wherein the Mg-Al alloy is 20 to 50% by weight of the core material, and the iron oxide is about 50 to 80% by weight. 15. The Mg-Al alloy is about 50% Mg and 50% Al
The cored tubular electrode according to claim 14, wherein the amount of alloy in the core material is about 30% by weight, and the iron oxide content is about 70% by weight based on the core material. 16. The cored tubular electrode of claim 13, wherein said tubular electrode has an outer diameter of about 0.025 to 3/8 inch and a wall thickness of about 0.005 to 0.05 inch. 17. Consisting of a metal tube and a particulate reactant metal mixed with a metal oxide that reacts substantially exothermically, with additives selected from arc stabilizers, melting agents, reducing agents and gas generating agents based on the total weight thereof. a compacted core material comprising from 0 to about 30 wt. The exothermically reactive metal oxide to be mixed is formed by providing at least one cored tubular metal arc electrode having a free energy of formation at 25° C. of about 90,000 calories per gram atom of oxygen; creating an electric arc between the metal member and the metal member for cutting or gouging; supplying a pressurized gas flow to the cutting or gouging location;
A method for cutting or gouging a metal material with an electric arc, comprising the step of continuing cutting or gouging while continuously supplying a pressurized gas flow to the location. 18. A method for cutting or gouging metallic materials with an electric arc according to claim 17, wherein the gas stream is supplied under pressure along the length of the electrode towards the point of cutting and gouging. 19. The core material substantially comprises about 10-70% by weight of a reactive metal, about 30-90% by weight of a metal oxide, and 0-20% by weight of a metal oxide.
18. A method for cutting or gouging metallic materials with an electric arc as claimed in claim 17, comprising weight percent of an additive selected from the group consisting of arc stabilizers, melting agents, reducing agents and gas generating agents. 20. Claim 1, wherein the reactant metal is selected from magnesium, aluminum, zirconium, titanium, and alloys of at least two of these metals.
A method of cutting or gouging the metal material according to item 9 with an electric arc. 21. The method of cutting or gouging a metal material with an electric arc according to claim 20, wherein the reactant metal is an Mg-Al alloy and the metal oxide is an iron-based metal oxide. 22. The metal material according to claim 21, wherein the Mg-Al alloy is about 20 to 50% by weight of the core material and the iron-based oxide is 50 to 80% by weight of iron oxide. A method of cutting or gouging with an arc. 23. The claim that the Mg-Al alloy is about 50% Mg, 50% Al, the amount of alloy in the core material is about 30% by weight, and the amount of iron oxide is about 70% by weight of the core material. A method of cutting or gouging the metal material according to item 22 with an electric arc. 24. Cutting the metallic material of claim 21 with an electric arc, wherein the tubular electrode has an outer diameter of about 0.025 to 3/8 inch and a wall thickness of about 0.005 to 0.05 inch. Or gouging method. 25. The gas has a nozzle pressure of about 10-150 psi.
Claim 1 provided along the length of the electrode at
A method of cutting or gouging the metal material according to item 7 with an electric arc. 26. The method of cutting or gouging a metal material with an electric arc according to claim 25, wherein the gas is supplied along an annular sheath surrounding the electrode. 27. The method of cutting or gouging a metal material with an electric arc according to claim 17, wherein the core material is 5 to 30% by weight based on the total weight of the electrode.